Laravel 9.0 support

Tried just updating composer.json and it seems to work fine, but fails one test:

PHPUnit 9.5.13 by Sebastian Bergmann and contributors.

Runtime:       PHP 8.1.0
Configuration: /Users/mike/eventually/phpunit.xml.dist

...........F

Time: 00:00.554, Memory: 28.00 MB

There was 1 failure:

1) Altek\Eventually\Tests\Integration\BelongsToMany\DetachTest::itSuccessfullyDetachesModels with data set #0 (2, null, array('articles', array(array(1, '1'), array(1, '2'))))
Failed asserting that two arrays are identical.
--- Expected
+++ Actual
@@ @@
     2 => Array &1 (
         0 => Array &2 (
             'user_id' => 1
-            'article_id' => '1'
+            'article_id' => 1
         )
         1 => Array &3 (
             'user_id' => 1
-            'article_id' => '2'
+            'article_id' => 2
         )
     )
 )

/Users/mike/eventually/tests/Integration/BelongsToMany/DetachTest.php:133
/Users/mike/eventually/vendor/laravel/framework/src/Illuminate/Support/Testing/Fakes/EventFake.php:175
/Users/mike/eventually/vendor/laravel/framework/src/Illuminate/Collections/Arr.php:717
/Users/mike/eventually/vendor/laravel/framework/src/Illuminate/Collections/Collection.php:358
/Users/mike/eventually/vendor/laravel/framework/src/Illuminate/Support/Testing/Fakes/EventFake.php:176
/Users/mike/eventually/vendor/laravel/framework/src/Illuminate/Support/Testing/Fakes/EventFake.php:101
/Users/mike/eventually/vendor/laravel/framework/src/Illuminate/Support/Facades/Facade.php:261
/Users/mike/eventually/tests/Integration/BelongsToMany/DetachTest.php:138

FAILURES!
Tests: 12, Assertions: 92, Failures: 1.